The Echo Show 15 looks nearly identical to the previous version. A white mat and a flat, narrow black frame still surround ...

With a Fire TV interface, Alexa voice control, and a camera for video calls and home monitoring, the Echo Show 21 is Amazon's largest smart display and all-in-one home hub.

We found dozens of electronics that we've tested ourselves on sale for Black Friday -- and all are less than $50 each.